Perhaps you should try some spelling variations:
"tests modeling algorithm" » "tests making algorithm" (Expand Search), "best modeling algorithm" (Expand Search), "results modeling algorithm" (Expand Search), "belt modeling algorithm" (Expand Search)
"elements mapping algorithm" » "elements making algorithm" (Expand Search), "elements mining algorithm" (Expand Search), "elements learning algorithm" (Expand Search), "element mapping algorithm" (Expand Search), "elemental mapping algorithm" (Expand Search), "elements during algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural finding algorithm" (Expand Search), "neural routing algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("tests modeling algorithm") OR ((("elements mapping algorithm") OR ("neural coding algorithm"))))~.
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• Removing quotes may allow a broader search: (( tests modeling algorithm ) OR ((( elements mapping algorithm ) OR ( neural coding algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("tests modeling algorithm") OR ((("elements mapping algorithm") OR ("neural coding algorithm"))))*.